LED is a very sensitive semiconductor lighting device that needs an advantageous driver. A new alternate double loops LED driver based on LM358 (which integrates two operational amplifiers) in line with the characteristics of LED is proposed. The driver demonstrates excellent output characteristics through both current and voltage control. The principle is discussed first and a Matlab simulation is conducted to analyze the control scheme in its amplitude frequency and phase frequency characteristic

verifying the stability of the scheme. Also its advantages and parameters calculation are discussed. The proposed scheme adopts buck topology and achieves alternate double loops control through LM358 which can accurately control the drivers output voltage and current. The Simulink simulation and experiment verify the availability and reliability of the proposed scheme.